INTRODUCTION: High-intensity interval training (HIIT) is an emerging lifestyle intervention strategy for controlling obesity. HIIT consisted of brief all-out supramaximal sprint intervals was termed as sprint interval training (SIT). This study was designed to examine the time-efficient characteristics of SIT in reducing abdominal visceral fat. METHODS: A randomized controlled trial was conducted to compare the specific adaptations of SIT (80x6 s all-out cycle sprints interspersed with 9 s passive recovery) with those resulting from a HIIT regimen with training volume relatively higher (repeated 4 min bouts of cycling at 90% VO2max alternated with 3 min rest, until the work of 400KJ was achieved), and with those of nonexercising control counterparts (CON). Forty-six obese young women (body fat percentage >= 30) received either SIT (n = 16), HIIT (n = 16), or no training (n = 14), 3 to 4 sessions per week, for 12 weeks. The abdominal visceral fat area (AVFA) and abdominal subcutaneous fat area (ASFA) of the participants were measured through computed tomography scans pre-intervention and post-intervention. Total fat mass and the fat mass of the android, gynoid, and trunk regions were assessed through dual-energy x-ray absorptiometry. RESULTS: Following the intervention, abdominal visceral and subcutaneous fat were reduced markedly (p < 0.05). The reduction in AVFA (-6.31 to -9.7 cm2) was not different between SIT and HIIT (p > 0.05), while the reduction in ASFA (-17.4 to -40.7 cm2) in SIT was less than that in HIIT (p < 0.05). Less reduction in the fat mass of the trunk (-1.2 to -2.0 kg) region was also found in SIT, while the reductions in fat percentage (-1.9% to -2.0%), total fat mass (-2.0 to -2.8 kg), and fat mass of the android (-0.2 to -0.2 kg), and gynoid (-0.4 to -0.3 kg) regions did not differ between the two regimes (p > 0.05). In contrast, the increase in VO2max was significant greater following the SIT than HIIT (p < 0.01). No variable changed in CON. CONCLUSION: Such findings suggest that the lower training load and exercise time commitments of the SIT regime could optimize the time-efficiency advantage of the traditional HIIT, facilitating the abdominal visceral fat reduction in obese young women.

Full text (sometimes free) may be available at these link(s):      help

• PubMed Central
• DOI
• PubMed
• PDF locator
• publisher